145185551 has 16 divisors (see below), whose sum is σ = 172780608. Its totient is φ = 119404800.

The previous prime is 145185533. The next prime is 145185553. The reversal of 145185551 is 155581541.

It is a cyclic number.

It is not a de Polignac number, because 145185551 - 2¹⁸ = 144923407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145185553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13361 + ... + 21653.

It is an arithmetic number, because the mean of its divisors is an integer number (10798788).

Almost surely, 2^145185551 is an apocalyptic number.

145185551 is a deficient number, since it is larger than the sum of its proper divisors (27595057).

145185551 is an equidigital number, since it uses as much as digits as its factorization.

145185551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8402.

The product of its digits is 20000, while the sum is 35.

The square root of 145185551 is about 12049.2967014677. The cubic root of 145185551 is about 525.5827856332.

The spelling of 145185551 in words is "one hundred forty-five million, one hundred eighty-five thousand, five hundred fifty-one".